EP 0143637 A2 19850605 - Feedback type comb filter.
Title (en)
Feedback type comb filter.
Title (de)
Rückkopplungskammfilter.
Title (fr)
Filtre en peigne à réaction.
Publication
Application
Priority
JP 22270983 A 19831126
Abstract (en)
A feedback type comb filter comprises a first delay (21) circuit supplied with an input signal, a first adding circuit (12) supplied with an output of the first delay circuit (21), a second delay circuit supplied (22) with an output of the first adding circuit, a second adding circuit (14) supplied with an output of the second delay circuit (22) and the input signal which is passed through a signal path having a delay time <sub>73</sub>, and a feedback path including a coefficient multiplier (15) for multiplying a coefficient k to an output of the second adding circuit (14). The feedback path has a delay time τ<sub>2</sub> and supplies the output of the second adding circuit (14) to the first adding circuit (12) through the coefficient multiplier (15). The first adding circuit (12) adds the output of the first delay circuit (21) and the signal from the feedback path, and supplies the output thereof to the second delay circuit (22). A delay time <sub>T1</sub> of the first delay circuit (21) is equal to a sum of the delay time τ<sub>2</sub> of the feedback path and the delay time τ<sub>3</sub> of the signal path. A delay time T<sub>H</sub> of the second delay circuit (22) is equal to a value which is smaller than a predetermined time Tp by the delay time τ<sub>2</sub> of the feedback path, where the predetermined time Tp corresponds to a frequency interval between center frequencies of two adjacent pass bands in a comb filter characteristic of the comb filter.
IPC 1-7
IPC 8 full level
H03H 15/00 (2006.01); H03H 11/04 (2006.01); H04N 9/78 (2006.01)
CPC (source: EP US)
H03H 11/04 (2013.01 - EP US); H04N 9/78 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0143637 A2 19850605; EP 0143637 A3 19870401; EP 0143637 B1 19900816; DE 143637 T1 19851024; DE 3482988 D1 19900920; JP S60114017 A 19850620; US 4617588 A 19861014
DOCDB simple family (application)
EP 84308190 A 19841126; DE 3482988 T 19841126; DE 84308190 T 19841126; JP 22270983 A 19831126; US 67454484 A 19841126